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Commit1b0e27a

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Add getValues() method to HashTable and update LinkedList READMEs.
1 parent46daaf5 commit1b0e27a

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4 files changed

+28
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4 files changed

+28
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‎src/data-structures/doubly-linked-list/README.md‎

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@@ -12,7 +12,7 @@ consists of a set of sequentially linked records called nodes. Each node contain
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two fields, called links, that are references to the previous and to the next
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node in the sequence of nodes. The beginning and ending nodes' previous and next
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links, respectively, point to some kind of terminator, typically a sentinel
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node or null, to facilitate traversal of the list. If there is only one
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node or null, to facilitatethetraversal of the list. If there is only one
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sentinel node, then the list is circularly linked via the sentinel node. It can
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be conceptualized as two singly linked lists formed from the same data items,
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but in opposite sequential orders.

‎src/data-structures/hash-table/HashTable.js‎

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@@ -107,14 +107,15 @@ export default class HashTable {
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}
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/**
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* Gets the list of all the stored values in the hash table in the order of
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* the keys map.
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* Gets the list of all the stored values in the hash table.
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*
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*@return {*[]}
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*/
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getValues(){
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constkeys=this.getKeys();
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returnkeys.map(key=>this.buckets[this.hash(key)].head.value.value);
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returnthis.buckets.reduce((values,bucket)=>{
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constbucketValues=bucket.toArray()
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.map((linkedListNode)=>linkedListNode.value.value);
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returnvalues.concat(bucketValues);
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},[]);
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}
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}

‎src/data-structures/hash-table/__test__/HashTable.test.js‎

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@@ -94,6 +94,24 @@ describe('HashTable', () => {
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hashTable.set('b','beta');
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hashTable.set('c','gamma');
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expect(hashTable.getValues()).toEqual(['alpha','beta','gamma']);
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expect(hashTable.getValues()).toEqual(['gamma','alpha','beta']);
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});
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it('should get all the values from empty hash table',()=>{
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consthashTable=newHashTable();
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expect(hashTable.getValues()).toEqual([]);
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});
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it('should get all the values in case of hash collision',()=>{
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consthashTable=newHashTable(3);
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// Keys `ab` and `ba` in current implementation should result in one hash (one bucket).
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// We need to make sure that several items from one bucket will be serialized.
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hashTable.set('ab','one');
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hashTable.set('ba','two');
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hashTable.set('ac','three');
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expect(hashTable.getValues()).toEqual(['one','two','three']);
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});
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});

‎src/data-structures/linked-list/README.md‎

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@@ -4,7 +4,8 @@ _Read this in other languages:_
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[_简体中文_](README.zh-CN.md),
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[_Русский_](README.ru-RU.md),
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[_日本語_](README.ja-JP.md),
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[_Português_](README.pt-BR.md)
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[_Português_](README.pt-BR.md),
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[_한국어_](README.ko-KR.md)
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In computer science, a**linked list** is a linear collection
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of data elements, in which linear order is not given by

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